The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 26, 2000
Filed:
Aug. 11, 1997
Lynn Bernau, Streamwood, IL (US);
Jeffrey M Klein, Chicago, IL (US);
Cherie H Wilkinson, Chicago, IL (US);
Pittway Corporation, Chicago, IL (US);
Abstract
A duct mountable smoke detector includes a smoke sensor, an alarm indicating output relay, and an air flow control relay. In the presence of an alarm condition, the alarm indicating relay is energized thereby producing an alarm indicating signal. The air flow control relay is also energized thereupon changing an operative state of the respective air flow control element. Finally, a signal is coupled to an input/output interconnect port and, via an interconnect link, to other detectors coupled to the link. Other detectors coupled to the link which receive an alarm indicating interconnect signal energize the respective air flow control relays thereby changing operative state of the respective air flow control devices. The other detectors do not enter an alarm state. This allows for easy determination of the detector that initiated the alarm.